英语写作句型：开头如何写？说明话题争议性。
说明话题争议性
Identifying a controversy within the field of study简短的句型：
X is a controversial problem that ...A much debated question is whether …
One major issue in early X research concerned …
Questions have been raised about ...稍复杂句型：
The debate about X has gained fresh prominence with many arguing that …The controversy about scientific evidence for X has raged unabated for over a century.
In the literature on X, the relative importance of Y is debated.
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